Renamed iosAppSwift to RollbarDemo, moved into new Examples dir

[matux]

Description of the change

Renamed iosAppSwift to RollbarDemo, and moved into new Examples dir.

No change in any sort of business logic whatsoever, except removing support for landscape orientation which the Demo app really doesn't support.

This PR is being merged into the feature/integration_examples feature branch.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Related issues

• Part of SC-128322

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

[shortcut-integration]

This pull request has been linked to Shortcut Story #128322: Apple SDK integration examples.